JPH064609U - Sensor bar mounting device for road pavement deflection measurement machine - Google Patents

Abstract

(57) [Summary] [Purpose] Impact and vibration due to vertical movement of the weight do not propagate to the sensor bar, and the sensor bar can be moved up and down by the movement of the loading plate. [Structure] A pair of mounting plates 77 are suspended from and mounted on a load receiving plate of a road pavement deflection amount measuring machine. The pair of mounting shafts 76 are attached to the sensor bar 23 having the sensor 24 in the horizontal direction. The mounting shaft 76 is attached to the hole 78 of the mounting plate 77.
To face. When the loading plate 20 is grounded, the mounting shaft 76 is located in the upper and lower intermediate portions of the hole 78, and the impact / vibration of the loading plate does not propagate to the sensor bar 23. The sensor bar 23 is lifted in contact with the above to separate the sensor 24 from the road surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for mounting a sensor bar of a road pavement flexure measuring machine on a vehicle body, which nondestructively measures the flexure of road pavement and evaluates the strength of the pavement.

[0002]

[Prior art]

 As a device for measuring the amount of road pavement deflection, a weight is dropped from a certain height on a load receiving plate equipped with a loading plate that is installed on the traveling carriage and the road surface deflection amount at that time is measured by multiple deflection sensors. There is known a device called a falling weight deflectometer that is used for detecting in.

[0003]

[Problems to be solved by the device]

 In such a road pavement deflection measuring machine, the sensor must be attached to the sensor bar when the sensor is in contact with the road surface at the time of measurement, and the sensor must be separated from the road surface when traveling to the next measurement point after the measurement is completed. The server is connected so that it can move up and down together with the loading plate. For this reason, the shock and vibration when the weight is moved up and down propagates to the sensor bar, which causes an error in the measurement of the amount of deflection. In particular, when a displacement sensor is used, it is easily affected by shock and vibration, resulting in measurement error.

Therefore, an object of the present invention is to provide a sensor bar mounting device for a road pavement deflection amount measuring machine which can solve the above-mentioned problems.

[0005]

[Means for Solving the Problems]

 A movable member 13 is provided on a vehicle body 2 of the traveling carriage 1 so as to be vertically movable by an elevating mechanism 14, and a guide shaft 15 is suspended on the movable member 13, and a loading plate is mounted on the guide shaft 15 via a substrate 17 and a load receiving plate 18. 20 is mounted, a weight 21 is vertically movable along the guide shaft 15, the load plate 20 described above is grounded, and a sensor 24 provided in the sensor server 23 is grounded to move the weight 21 up and down. In a road pavement deflection amount measuring device in which a load is applied to a road surface through a plate 20 and a sensor 24 measures a road surface deflection amount, a plurality of the sensor 24 are attached to a sensor bar 23 at intervals in the longitudinal direction. A pair of mounting shafts 76 are mounted horizontally on both sides of the server 23 near the front end in the longitudinal direction, and a pair of mounting plates 77 are mounted on both sides of the load receiving plate 18. The mounting shaft 77 is formed with a hole 78 facing the mounting shaft 76, and the positional relationship between the hole 78 and the mounting shaft 76 is set when the loading plate 20 is lowered together with the load receiving plate 18 to be grounded. A road pavement in which the shaft 76 is located in the upper and lower middle portion of the hole 78 and the mounting shaft 76 is brought into contact with the bottom of the hole 78 when the loading plate 20 is lifted together with the load receiving plate 18 and is separated from the road surface. Sensor bar mounting device for the deflection amount measuring machine.

[0006]

[Work]

 When the loading plate 20 is in contact with the road surface for measurement, the mounting shaft 76 of the sensor bar 23 is located in the upper and lower middle portion of the hole 78 of the mounting plate 77 and the sensor 24 is in contact with the road surface. Since the impact and vibration due to the vertical movement of the weight 21 do not propagate to the sensor server 23 due to the non-contact with the sensor 21, accurate measurement can be performed even with a displacement sensor, and when the loading plate 20 is lifted and separated from the road surface, the mounting plate 77 The bottom of the hole 78 contacts the mounting shaft 76, and the sensor bar 23 is lifted and the sensor 24 moves away from the road surface. Therefore, when the vehicle travels between the measurement points, the loading plate 20 is lifted to separate the sensor 24 from the road surface. it can.

[0007]

【Example】

 As shown in FIGS. 1 and 2, a vehicle body 2 of a traveling carriage 1 towed by a vehicle (not shown) includes a front vehicle body 6 including a front frame 3, an intermediate frame 4, and a pair of front side frames 5 and 5, A pair of rear side frames 7, 7 connected to the intermediate frame 4 and a rear vehicle body 10 which is substantially U-shaped than the pair of connecting frames 9, 9 are provided between the pair of rear side frames 7, 7. The horizontal frame 11 is laid across in parallel with the intermediate frame 4, and the mounting horizontal member 12 is constituted by them. A movable member 13 is provided on the mounting cross member 12 so as to be vertically movable by an elevating mechanism 14, and a guide shaft 15 is suspended and connected to the movable member 13 by a joint 16. The lower end of the guide shaft 15 is connected to the movable member 13. A board 17 is attached, a load receiving plate 18 is attached to the board 17, and a plurality of loading plates 20 are provided on the load receiving plate 18 via an adhesion mechanism 19. A weight 21 is provided along the guide shaft 15 so as to be vertically movable by a weight cylinder 22 built in the guide shaft 15. The weight 21 is provided on the sensor bar 23 by pressing the load plate 20 against the road surface and dropping the weight 21. The sensor 24 is loaded.

The sensor bar 23 includes a short front sensor bar 25 supported above the loading plate 20, and a rear sensor bar 26 rotatably connected to the front sensor bar 25, and a rear portion thereof. By rotating the sensor bar 26 upward, a standing posture substantially parallel to the guide shaft 15 can be obtained.

A hydraulic hoop 27, an operation valve 26, a tank 29, a controller 30 and the like are arranged on the front vehicle body 6, and an exterior cover 31 is attached to an upper surface of the front vehicle body 6 and an upper surface of the rear vehicle body 10 to provide the above-mentioned components. The outer cover 31 covers members and is composed of a substantially small front outer cover 32 and a pair of rear outer covers 34 and 34 which are attached to the rear opening edge of the front outer cover 32 by a hinge 33 so as to be openable and closable. The front outer cover 32 is provided with a lid 32a for inspection, and by opening the pair of rear outer covers 34, 34, the rear sensor bar 26 is brought into a substantially upright posture, and again the pair of rear outer covers is provided. By closing 34, 34, the rear sensor bar 26 can be covered with the exterior cover 31.

A lower cover 35 that covers the loading plate 20 is attached below the rear vehicle body 10. The mounting structure of the lower cover 35 will be described below with reference to FIGS. One longitudinal ends of one side supporting arm 40 and the other side supporting arm 41 are rotatably movable in a horizontal plane direction through a vertical pin 42 and a bracket 43 at an intermediate portion in the longitudinal direction of the intermediate frame 4 of the front vehicle body 6. The one side lower cover 44 and the other side lower cover 45 are attached to the lower portions of the one side and the other side supporting arms 40 and 41, and the one side lower cover 44 and the other side lower cover 45 are front plates 44a. , 45a, bottom plates 44b, 45b, rear plates 44c, 45c, and side plates 44d, 45d form a box-like shape with the upper and lower sides facing each other. Then, the opening edges of the one side / other side lower covers 44, 45 come into contact with each other to cover the loading plate 20, and the one side / other side supporting arms 40, 41 are separated from each other so that the weight is not supported. Other side lower part Opening edge of over 44 and 45 spaced apart away from the loading plate 20.

A support frame 46 is laid horizontally between the pair of rear frames 7, 7 near the rear of the rear frame 7, and levers 47 fixed to both ends of the support frame 46 in the longitudinal direction are provided on the upper surface of the rear frame 7 near the rear. A horizontal pin 49 supports a bracket 48 fixedly attached to the upper and lower portions so that the support frame 46 can be inverted 180 degrees between a front position shown by a solid line and a rear position shown by an imaginary line in FIG. There is. An interlocking arm 50 is fixed to each of the vertical pins 42, and each interlocking arm 50 is connected by a rod 51. When the other side support arm 41 is rotated in a horizontal direction with a grip 52, one side is moved. The support arm 40 rotates in synchronization. One end of a fixing lever 53 is rotatably supported on the rear ends of the pair of rear side frames 7 and 7, respectively, and a lock piece 54 is provided on the other end of each fixing lever 53. The lock piece 54 is integrally formed and can be engaged with and disengaged from a bracket 55 attached to the contact mechanism 19. As shown in FIG. 4, the weight 21 is in contact with the base plate 17 via the buffer rubber 56, and the reinforcing ribs 57 provided on the lower surface of the base plate 17 are mounted on the support tools 58 of the one-side and the other-side support arms 40 and 41. The support arms 40 and 41 on one side and the other side are in contact with each other on the support 59 of the support frame 46. As shown in FIGS. 3 and 5, a supporting member 61 is attached to a cross member 60 fixed to the other side supporting arm 41, and a reinforcing rib 57 is in contact with the supporting member 61.

As shown in FIGS. 3 and 5, a locking mechanism 62 is provided across the one side support arm 40 and the support frame 46. The lock mechanism 62 includes an attachment bracket 63 attached to the one-sided support arm 40, a lock rod 64 rotatably supported by the attachment bracket 63, an operation lever 65 fixed to the lock rod 64, and a support frame. The fixing bracket 66 fixed to 46 is provided, and the one side supporting arm 40 is fixed to the supporting frame 46 at the weight supporting position by engaging the locking rod 64 with the locking groove 67 of the fixing bracket 66.

Next, the opening / closing operation of the lower cover 35 will be described. When the traveling vehicle 1 is towed and transported for transportation, the one side / other side supporting arms 40, 41 are rotated to the weight supporting positions shown in FIGS. 3 to 5 and fixed to the supporting frame 46 by the lock mechanism 62. . At the same time, the opening edges of the one side / other side lower covers 44, 45 contact and cover the loading plate 20. The reinforcing ribs 57 of the board 17 are placed on the support tools 58 of the one-side / other-side support frames 40 and 41 to support the weight 21, and the lock piece 54 of the fixing lever 53 is engaged with the bracket 55 of the contact mechanism 19. The weight 21 is supported so that it does not move. At the time of measurement, the weight 21 is lifted to separate the reinforcing rib 57 of the substrate 17 from the support tool 58, the lock mechanism 62 is released, and the grip 52 is held to rotate the other side support frame 41 horizontally to support one side. Together with the hood 40, the weight is not supported by the phantom line in FIG. The support frame 46 is reversed to the rear position so that the support frame 46 is separated from the substrate 17 so that the weight 21 with the substrate 17 is not interfered with. When the other side support arm 41 is set to the weight non-supporting position, the engaging recess 68a of the engaging block 68 provided on the other side support arm 41 is provided with the engaged block provided on the connecting horizontal member 11 as shown in FIG. The other side one side support arms 41 and 42 are held so as not to swing by engaging with the engaging convex portion 69a of 69.

Next, the mounting of the sensor bar 23 will be described. As for the sensor bar 23, as shown in FIG. 7, a short front sensor bar 25 and a long rear sensor bar 26 are rotatably connected by a pin 70, and a screw rod 72 provided with a handle 71 is screwed into the sensor bar 23. As a result, it can be fixed in a straight line, and by loosening the screw member 72, it can be rotated upward. A plurality of sensors 24 are attached to the front and rear sensor bars 25 and 26 at intervals in the longitudinal direction, and a sensor attachment member 73 is attached to the sensor bar 25. A sensor bar support mechanism 74 is attached to each end.

As shown in FIG. 8, the sensor mounting member 73 includes an upward U-shaped mounting bracket 75 bolted to both side surfaces of the front sensor bar 25, and a pair of mounting brackets 75 provided on both side surfaces of the mounting bracket 75. The mounting shafts 76 are fixed horizontally, and the pair of mounting shafts 76 faces the holes 78 of the pair of mounting plates 77, respectively. This hole 78 is composed of a first hole 80 having a V-shaped bottom portion 79 which is wide in the longitudinal direction of the sensor bar, and a second hole 82 having an arc-shaped bottom portion 81 continuous with the upper portion of the first hole 80. The bottom portion 81 is located above the V-shaped bottom portion 79. As shown in FIGS. 7 and 9, the sensor bar support mechanism 74 includes a pair of brackets 83 and 83 attached to both side surfaces of the rear sensor bar 26, and a pair of cylinders 84 attached to the lower surfaces of the brackets 83. A grounding rod 86 having a piston 85 fitted in each of the cylindrical bodies 84 is provided, and a spring 88 is provided between the piston 85 and the spring receiver 87 to project the grounding rod 86 downward. The spring strength of the spring 88 can be adjusted by pressing the adjustment bolt 89 screwed on the bracket 83 against the spring receiver 87 and tightening and loosening the adjustment bolt 89. 90 is a thrust bearing. The sensor bar support mechanism 74 mounted near the front of the rear sensor bar 26 may have three ground points as a shape having one ground leg 86.

As shown in FIGS. 10 and 11, the pair of mounting plates 77 are mounted on both side surfaces of the load receiving plate 18 with bolts 91 and hang down on both sides of the contact mechanism 19, and The server 25 is located between the left and right contact mechanisms 19, 19 and the pair of mounting shafts 76 faces the hole 78 of the mounting plate 77 from between the front and rear contact mechanisms 19, 19.

Next, the operation of the sensor bar 23 will be described. When the loading plate 20 descends and comes into contact with the road surface of the paved road, the grounding legs 86 of the pair of sensor bar support mechanisms 75 come into contact with the road surface and the sensors 24 come into contact with the road surface. That is, the grounding leg 86 compresses the spring 88 by the weight of the sensor bar 23 so that each sensor 24 contacts the road surface. The spring strength of the spring 88 is adjusted by the adjusting bolt 89 so that the sensor 24 contacts the road surface. At this time, as shown in FIG. 10, the mounting shaft 76 is located in the vertical center of the first hole 80 in the hole 78 of the mounting plate 77, and the mounting plate 77 and the mounting shaft 76 do not contact each other. In this state, the weight 21 is moved up and down, a load is applied to the loading plate 20, and the amount of bending of the road surface is detected by each sensor 24. At this time, since the shock or vibration generated when the weight 21 collides with the substrate 17 does not propagate to the sensor bar 23, even if a displacement sensor is used as the sensor 24, it does not affect the measurement of the deflection amount. After the measurement of the amount of deflection is completed and the traveling vehicle 1 travels a short distance to the next point, the loading plate 20 is raised. As a result, as shown in FIG. 12, the V-shaped bottom portion 79 of the first hole 80 in the hole 78 of the mounting plate 77 contacts the mounting shaft 76, the sensor bar 23 moves upward together with the loading plate 20, and the grounding leg 86, The sensor 24 moves away from the road surface. When all the work of measuring the amount of deflection is completed and the traveling carriage 1 is towed in a loosely spaced manner, the sensor bar 23 is moved in the longitudinal direction as shown in FIG. The loading plate 20 is raised by being positioned in the second hole 82 in 78, and the mounting shaft 76 is fitted into the arc-shaped bottom portion 81 of the second hole 82 to support the sensor bar 23 on the mounting plate 77 without fine movement. As a result, the sensor bar 23 does not move slightly when the traveling vehicle 1 is towed.

Next, the operation of storing the sensor bar 23 when towing the vehicle will be described. When the traveling vehicle 1 is towed to a remote location, the pair of rear outer covers 34, 34 of the cover exterior 31 are opened, and the rear sensor bar 26 is pivoted upward about the pin 70 to be shown in FIG. In this way, the clamp mechanism 100 holds it in an upright posture substantially parallel to the guide shaft 15, and the pair of rear exterior covers 34, 34 are closed to store the rear sensor server 26 in the exterior cover 31.

As shown in FIG. 4, the clamp mechanism 100 includes a lock rod 102 provided on a bracket 101 attached to the board 17, and a bracket 103 attached to the rear sensor bar 26. The lock rod 102 is attached to the bracket 103. A slit-shaped engaging groove 104 for engaging and disengaging is formed, and the engaging groove 104 is engaged with the lock rod 102 to hold the rear sensor bar 26 in the upright posture.

As shown in FIG. 10, a guide plate 120 is attached downward to the horizontal frame 11, a roller 122 is attached to an arm 121 attached to the load receiving plate 18, and the traveling carriage 1 is mounted on an inclined pavement. When the vehicle is stopped on the road and the amount of deflection is measured, when the guide shaft 15 swings relative to the joint 16 as a fulcrum and becomes vertical, the roller 122 contacts the guide plate 120 and the load receiving plate 18 Is designed so that it can be raised and lowered smoothly.

[0021]

[Effect of device]

 When the loading plate 20 is in contact with the road surface for measurement, the mounting shaft 76 of the sensor bar 23 is located in the upper and lower middle portion of the hole 78 of the mounting plate 77 and the sensor 24 is in contact with the road surface. Since the impact and vibration due to the vertical movement of the weight 21 do not propagate to the sensor server 23 due to the non-contact with the sensor 21, accurate measurement can be performed even with a displacement sensor, and when the loading plate 20 is lifted and separated from the road surface, the mounting plate 77 The bottom of the hole 78 contacts the mounting shaft 76, and the sensor bar 23 is lifted and the sensor 24 moves away from the road surface. Therefore, when the vehicle travels between the measurement points, the loading plate 20 is lifted to separate the sensor 24 from the road surface. it can. By fitting the mounting shaft 76 into the arcuate bottom portion 81 of the second hole 82 of the hole 78, the mounting shaft 76 does not slightly move with respect to the mounting plate 77. Therefore, the sensor server 23 can be slightly moved when traveling and transporting to a remote place. Can be reliably supported without

[Brief description of drawings]

FIG. 1 is an overall front view of a road pavement deflection amount measuring machine.

FIG. 2 is an overall plan view of a road pavement deflection amount measuring device.

FIG. 3 is a plan view of a lower cover mounting portion.

FIG. 4 is a front view of a lower cover mounting portion.

FIG. 5 is a rear view of the lower cover mounting portion.

FIG. 6 is a schematic perspective view of a lower cover mounting portion.

FIG. 7 is a front view of a sensor bar.

FIG. 8 is a perspective view of a sensor bar mounting member.

FIG. 9 is a sectional view of a sensor bar support mechanism.

FIG. 10 is a front view of a sensor bar mounting portion.

FIG. 11 is a rear view of the sensor bar mounting portion.

FIG. 12 is a front view for explaining the operation of the sensor bar mounting portion.

FIG. 13 is a front view for explaining the operation of the sensor bar mounting portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Traveling vehicle, 2 ... Vehicle body, 13 ... Movable member, 14 ... Elevating mechanism, 15 ... Guide shaft, 17 ... Board, 18 ... Load receiving plate, 20 ... Loading plate, 23 ... Sensor bar, 24 ... Sensor, 76 ... Mounting shaft, 77 ... Mounting plate, 78 ... Hole, 79 ...
V-shaped bottom portion, 80 ... First hole, 81 ... Arc-shaped bottom portion, 82 ...
Second hole.

Claims (2)

[Scope of utility model registration request] 1. A movable member 13 is provided on a vehicle body 2 of a traveling carriage 1 so as to be vertically movable by an elevating mechanism 14, and a guide shaft 15 is hung on the movable member 13, and the guide shaft 15 is suspended.
A loading plate 20 is attached to the base plate 17 via a load receiving plate 18, a weight 21 is vertically movable along the guide shaft 15, the loading plate 20 is grounded, and a sensor 24 provided on a sensor bar 23 is provided. In the road pavement deflection amount measuring device in which the sensor 24 measures the amount of deflection of the road surface by grounding the weight 21, moving the weight 21 up and down, and applying a load to the road surface through the loading plate 20, A plurality of mounting shafts 76 are mounted at intervals in the direction, a pair of mounting shafts 76 are mounted horizontally on both sides of the sensor bar 23 toward the front end in the longitudinal direction, and a pair of mounting plates 77 are hung on both sides of the load receiving plate 18. And a hole 78 in which the mounting shaft 76 faces the mounting plate 77.
When the load receiving plate 18 and the loading plate 20 are lowered and grounded, the mounting shaft 76 is located at the upper and lower intermediate portions of the hole 78.
8. A sensor bar mounting device for a road pavement deflection measuring device, wherein the mounting shaft 76 is brought into contact with the bottom of the hole 78 and lifted when the loading plate 20 is lifted together with 8 to be separated from the road surface. 2. The hole 78 of the mounting plate 77 is formed by a first hole 80 having a V-shaped bottom portion 79 and a second hole 82 having an arc-shaped bottom portion 81 continuous with the upper portion of the first hole 80. The sensor bar mounting device for road paving according to claim 1, wherein the mounting shaft 76 is fitted to the arcuate bottom 81 of the second hole 82.